/*
 * Copyright (c) 2009 Piotr Piastucki
 * 
 * This file is part of Patchca CAPTCHA library.
 * 
 *  Patchca is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *  
 *  Patchca is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Lesser General Public License for more details.
 *  
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with Patchca. If not, see <http://www.gnu.org/licenses/>.
 */
package cn.dreampie.captcha.filter.library;


public class WobbleImageOp extends AbstractTransformImageOp {

  private double xWavelength;
  private double yWavelength;
  private double xAmplitude;
  private double yAmplitude;
  private double xRandom;
  private double yRandom;
  private double xScale;
  private double yScale;

  public WobbleImageOp() {
    xWavelength = 15;
    yWavelength = 15;
    xAmplitude = 4.0;
    yAmplitude = 3.0;
    xScale = 1.0;
    yScale = 1.0;
    xRandom = 3 * Math.random();
    yRandom = 10 * Math.random();
  }

  public double getxWavelength() {
    return xWavelength;
  }

  public void setxWavelength(double xWavelength) {
    this.xWavelength = xWavelength;
  }

  public double getyWavelength() {
    return yWavelength;
  }

  public void setyWavelength(double yWavelength) {
    this.yWavelength = yWavelength;
  }

  public double getxAmplitude() {
    return xAmplitude;
  }

  public void setxAmplitude(double xAmplitude) {
    this.xAmplitude = xAmplitude;
  }

  public double getyAmplitude() {
    return yAmplitude;
  }

  public void setyAmplitude(double yAmplitude) {
    this.yAmplitude = yAmplitude;
  }

  public double getxScale() {
    return xScale;
  }

  public void setxScale(double xScale) {
    this.xScale = xScale;
  }

  public double getyScale() {
    return yScale;
  }

  public void setyScale(double yScale) {
    this.yScale = yScale;
  }


  protected void transform(int x, int y, double[] t) {
    double tx = Math.cos((double) (xScale * x + y) / xWavelength + xRandom);
    double ty = Math.sin((double) (yScale * y + x) / yWavelength + yRandom);
    t[0] = x + xAmplitude * tx;
    t[1] = y + yAmplitude * ty;
  }

}
